Upon ingestion, aspartame is broken down in the digestive system into its constituent parts: phenylalanine, aspartic acid, and methanol. These components are absorbed into the bloodstream and metabolized through normal biochemical pathways. Phenylalanine and aspartic acid are amino acids that are used by the body in protein synthesis, while methanol is further converted into formaldehyde and formic acid, which are then rapidly eliminated.